Summary: Ctors | Methods | Inherited Methods

MutableLiveData

Kotlin |Java

public class MutableLiveData
extends LiveData<T>

java.lang.Object
↳	androidx.lifecycle.LiveData<T>
	↳	androidx.lifecycle.MutableLiveData<T>

Known direct subclasses

MediatorLiveData<T> LiveData subclass which may observe other LiveData objects and react on OnChanged events from them.

LiveData which publicly exposes setValue(T) and postValue(T) method.

Summary

Public constructors
`MutableLiveData(T value)` Creates a MutableLiveData initialized with the given `value`.
`MutableLiveData()` Creates a MutableLiveData with no value assigned to it.

Public methods
`void`	`postValue(T value)` Posts a task to a main thread to set the given value.
`void`	`setValue(T value)` Sets the value.

From class


        
          androidx.lifecycle.LiveData

`T`	`getValue()` Returns the current value.
`boolean`	`hasActiveObservers()` Returns true if this LiveData has active observers.
`boolean`	`hasObservers()` Returns true if this LiveData has observers.
`void`	`observe(LifecycleOwner owner, Observer<? super T> observer)` Adds the given observer to the observers list within the lifespan of the given owner.
`void`	`observeForever(Observer<? super T> observer)` Adds the given observer to the observers list.
`void`	`onActive()` Called when the number of active observers change from 0 to 1.
`void`	`onInactive()` Called when the number of active observers change from 1 to 0.
`void`	`postValue(T value)` Posts a task to a main thread to set the given value.
`void`	`removeObserver(Observer<? super T> observer)` Removes the given observer from the observers list.
`void`	`removeObservers(LifecycleOwner owner)` Removes all observers that are tied to the given `LifecycleOwner`.
`void`	`setValue(T value)` Sets the value.

From class


        
          java.lang.Object

public MutableLiveData (T value)

Creates a MutableLiveData initialized with the given value.

Parameters
`value`	`T`: initial value

public MutableLiveData ()

Creates a MutableLiveData with no value assigned to it.

public void postValue (T value)

Posts a task to a main thread to set the given value. So if you have a following code executed in the main thread:

 liveData.postValue("a");
 liveData.setValue("b");

The value "b" would be set at first and later the main thread would override it with the value "a".

If you called this method multiple times before a main thread executed a posted task, only the last value would be dispatched.

Parameters
`value`	`T`: The new value

public void setValue (T value)

Sets the value. If there are active observers, the value will be dispatched to them.

This method must be called from the main thread. If you need set a value from a background thread, you can use postValue(Object)

Parameters
`value`	`T`: The new value